Process for the manufacture of cellulose solutions



6 F13 is i FFICE.

W335 1E0 cm oomnom ZWB a FOR THE MNUEAQ'E'U'FJE Q3 ommmoss EmIiUEEQNS.

collocamcg czmoemr 1c lmcwn that l] Ams-xswocs Cmsssrs, ci o Germany, residing ct Aachen iifl'o invented cor-min new and proscmcnts in a Process for the sebum of ()clluloso Soiut-ionc, of co clio following is o spccificctioo, to Wilisiiitiers known proposi- U. Potent LIA-1,51 cellulosemi-ions ore produccd by the acocliioi'ic acid (above coni c} with cclluloso-conmil ing mcicici".

rizioii hydrochloric aciofi roout the process is com his high progaoraion gives rise ciiificcltios regards recovery of cool cubsoqocnt treatment of the solcc'ioc, for cxcmplo"for convericso glucose or alcohol. In the Willso" @EIIQCSSS cho rs roferrcd to, ocllulosic (c. coticn} can be .lmsocleo with patio of very highly oonocnti'scod ciiloz'ic acid), {say 1,209sp. g. of, 15

:11. i Ki,

coco, a mi of the Hill can then. be rosoil from all?) solution by subjecting tho so a gici'ticl vacuum, after which the i E) scion can be squirted througlic o inzo mm, is form a'thrcod oi PG (or scgor'ecipicstcci) cellulose ll 1c n swinger scicis are mad, in 1.939 (say 1.212 sp. g.) o "c5; moro concentrated solution of col; con Foo scoured. Iii-"appears however zinc liVillstiiiler process a very great vory strong hycli'oohlomc acid cocci: '2 parts of 39% HCl solution,

oziit'l of coliulose) is required.

imlcncc with the present invention clissolvc the cellulose in subv siicollcc amounts of actual. HG :zc-w found that tho dissolving of oloso m cids stick as hydrochloric acid. rclinsrily assisteci sml sic-cob icc of contact ubstances substances which under sxv anccs are unaficctcnl 01" sub-- N unoffcctcci by the acid. Metals i for cztccci olc platinum and other ill!) platinum group,'tungstcn and .o, piacticcily insoluble in lly-iilO- l, coincfirst and lioroiilost umici' zillion contaci; substances. Metalcan serve the same purpose, but

, is suiiicieiit lion oi izlic chic tliciofoz. Metals can. so Q Application mes/slu s 1c, iccc. sins; ."s-Lvsccoc.

plsccol, oi mood in addition to, metal alloys prsciiccily insoluble? iii hydrochloric acidi, cosh fior example alloys of the platinum mccls, fcrroisungstc i, fcl'l'cvcnsclium, forromolybdomim, 'fccrowngsccnwanadium, Bil icicles and; so foriclic A further usable alloy, scrim-col Iilorchcrs metal, contains nickel 3(;35% chromium, 2.5% tungstem and cilvor, In this allo nickel may inc i'cploccd :ioc example by coba t, tong-- scan for cxcmgoic by molybdenum and silver for cscmplc by cooper. The contact sub stances ores gsccfismbiy ovalled in a form in which ciicy islio reaction products, for example in. the form of shoots rods or the like. In cei ibain circumstances is is also possibio to make the reaction ossol of contact substance material or of moiccriol containing the said subsssnccs, or it rosy loo inccnorly coated with such suhscsnccs,

One of tho advantages derived from the presence of contact substances is that a comparatively V432)? small quantity of acid for csci'yin out she dissolving process. As a rule, on y 0.5 to 1 part 0 hydrochloric to cm port of wood moici-icl. cmplo. In exceptional cases, as

.much cs two pacific of hydrochloric acid are mood to onc pom of wcozl.

It has mcrcovcr licon. found of advantage to scsis tho act-ion of hydrochloric acid (which loo ens in the liquid form) on colloiosc ictroclocii'ig hydrochloric acid 53225 in lilllfi process The process may be carricci ouia, d sco 31y Willstiittcr, with bydrochloric cc-icl o illl'iel' concentration than l owcvcr, acid at a.- lower concommotion. oo successfully used owing f0 tho aciion of the contact substances, more porlicclciiywhon liydrochloricccid gas is introduced. .li' example sawdust is slcncci moziorctcly concentrated acid cyclrocliici'ic acid is allowed to reset in tho presence of contact substances such as above sci and pi'cfercbly under agita locfisiisl, the temperature rises to 36 C and morc if time material is not cooled, Tlicsc conditions in which the formation of ct o concentration of 39% also; mom impossiblc. Dissolution howsvor pro-coals rapidly and smoothly owing to oration of contact substances.

' as been found advantageous to calico by using yi'cssurc. In

cam no oa-sily eliminated from.

new

Example.

(fine part of saw -dust with a proportion of Water of 20 to 30% is mixed with one part, of hydrochloric acid at any concentration. The moistened material is agitated at call nary temperature under introduction of hydrochloric acid gas and in the presence of :1 contact, substance shove descrihed, which may he added in the form oil pieces or sheet. The matci'ial is rapidly converted into pulp and then becomes liquid. The cellulose so lution thus formed can he easily separated from undissolvcd liguin which is in finely divided form. Glucose is obtained by diluting the cellulose solution with water. Glucose may be obtained as such 01" may he converted into alcohol by fermentation. The yield is as high as 63%. Water may be used in place of hydrochloric acid for moistening the cellulose-coutuiniug initial material.

I. call attention to the feet that While I have above, in the specific example, men tioned the use of the solution of cellulose for the production of glucose, it will he undei stood that the present invention involves L production of a solution of cellulose, whic can thereafter be employed for any 1 purpose.

l: claim:

l. A process for the manufacture of cel-= lulose solutions in concentrated lwd'rochil i'io acid, consistfiiig in cousin? hydrochlot'ic ucid to act at u nicdemte temperature upon me tcl'iel contnin'i cellulose in the presence metallic contact sul'istuuces which are not readily attacked by hydrochloric acid 2. A process for the manufacture of cel lulose solutions in concentrated hydrochloric acid. consisting in causing concentrated hydrochloric acid to act at a moderate.temporn'tui'e upon material containing; cellulose in the presence of metallic contuct substances which'zu'e not, readily {1i'.l351(3lit;tl by hydrochloric acid. I

3. A process for the l'lltllllliitltltlllg of ceilulose solutons in concentrated hydrochloric acid consisting: in cuusi" hydu lilo'ric acid to act eta. moderate teinpeirut l llpon rum terizil containing coll iose in the piesence of metallic contact sul u'uccs which are not readily attacked by hydrochloric acid, gas eous hydrochloric acid being introduced during the said treatment.

4-. A process for the"manufacture of cellulose solutions in concentrated hydrochloric acid, consisting in nioistcuing material con c clic ducted in the presence L a substance which is not readily attached hydrochloric acid and introducing hydrochloric acid until the cellulose con vet-ted into a solution.

5. A pi for the manu'tecttcc o lulose solutions in concentnt il l T acid consisting in treating moist ins containing cellulose in the wesez of tn lic cots h it incited ll .s 1 acid, co} i to not st, u 1 ed my terisl containing c a' metallic cut -i v H tucked by h "hloi'ic new the dissolming process by :2 tei'ial. i

7. A process for the mom lulose solutions in concent mte acid, consisting in causing h to act at {a moderate temps ore up tci'ml containing cellulose in the pres a metallic catalyst which not reecti tracked. by hydrochloric acid; such lremg' oa'idoctcd underiii/1V6 V in: which comp u small nn'iouut oi u" H )l'i'i? cell much J amount of metallic suhst dissolved by szi'f cutul shid again tively small amount of an agent which will by itself dissolve cellulose only if used in a much greater amount, while in the presence of a metal of the platinum group.

13. A process for the manufacture of cellulose solutions, which comprises causing an acid to act as asolvent upon cellulose-containing-material at moderate temperature in the presence of a metal which acts as a catalyst for the dissolvin action but which is substantially unaliecte by the acid used.

14. A process for the manufacture of cel lulose solutions, which comprises causing 11ydrochloric acid to act as a solvent upon cellulose-containing-material, in the presence of a metal of the platinum group.

15. A process which comprises causing hydrochlonc acid to act as a solvent on cellulose-containing-material,the amount of such acid being substantially less than 7 parts of hydrochloric acid solution of 89% strength to 1 part of cellulose, such action being conducted in the presence of a material which acts as a catalyst to aid the dissolving action of the hydrochloric acid on the cellulose.

16. A solution of cellulose in an acid, the amount of said acid corresponding to very substantially less than 7 parts of hydrochloric acid solution of 39% strength, to one part of cellulose.

17. A solution of cellulose in hydrochloric acid, the amount of such acid being substantially less than 7 parts of hydrochloric acid of 39% strength, to one part of cellulose.

In testimon whereof I afiix my signature.

- LEXANDER GLASSEN. 

